Does the fan run when you start the engine? If the sensor isn't sending a signal to the ECU, it will trip on the emergency cooling program.
The sensor is located on top of the engine, near the thermostat housing (between the 'V').
What do you mean by 'plugged in' next to the pipes, but 'not connected' the other side'? Is there not a wiring harness plugged into the end of the sensor?
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